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Yellowing Bud and Leaves

Hi i am on my first grow and I a 6 weeks in to flowering of two Alaskan Ice plants. the plants have started to turn yellow and have brown spots in between the veins on most of the leaves, the Main bud is going yellow from the top down I have moved light to 12" from the top of the plant the leaves are dry and brittle I am feeding with BioBiz Bloom and watering 2ltrs per plant every 4-5 days. The temperature drops quite low 15c so I have an oil filled radiator in there at night. I will post pics soon

temps daytime are 25-28c. it is affecting the whole plant the big fan leaves are going yellow and producing little brown spots they are very brittle and dry I have checked for bud rot and can’t find any I have also searched for mites and the grow room seems clean. The plants were very healthy 2 days ago. the inlet vent got blocked up and the extractor kept running could lack of C02 have caused this??

What are your night time temps with heater on, do you have one that records max min temps?

No turn left unstoned..''The problem with pH is that very, very few people have the equipment or wet laboratory skills to measure pH correctly. In hydro, you can achieve "good enough" with common sense and basic meters. But soil pH is an entirely different ballgame. Hydrogen ions attach to soil particles and cannot be removed by simply passing water over the soil''.

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